Dust-conveying attachment of sawmills.



No. 63l,6l5.- Patented Aug. 22, I899. M. L. BROWN. DUST CONVEYING ATTACHMENT FOB SAWMILLS.

(Application filed Jam 23, 1899.)

3 Sheets-Sheet I.

(No Model.)

No. 6313515. Patented Aug. 22,1899.

M.'L. BROWN. 1

' DUST 00 NNNNNNNNNNN GHNIENT FOR SAWMILLS.

(A licatinfild J9." is 1599 (No Model.) 3 Sheefs8he'el 3.

[mum V UNITED ST TES PATENT OFFIC MORTIMER L. BROWN, OF APPLETON, OHIO.

DUST-CONVEYING ATTACHMENT FOR SAWMILLS.

SPECIFICATION forming part of Letters Patent No. 631,615, dated August 22, 1899.

Application filed January 23, 1899. Serial No. 703,133. (No model.) i

To all whom it may concern.-

Be it known that I, MORTIMER L. BROWN, a citizen of the United States, residing at Appleton, in the'county of Licking and'State of Ohio, have invented certain new and useful Improvements in Dust Conveying Attach ments for Sawmills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to dust-conveying attachments for circular saws or analogous devices; and the purpose of the same is to take the dust and small particles of bark from one side of the saw-blade and deposit it in the eye of a horizontal fan, from which it is carried under pressure through a conduit, and thereby avoid the formation of a deep pit be neath the saw-blade, which is liable to become filled with water and freeze, to the great detriment of the operation of the saw, and also to practically and efficiently relieve the saw and relative parts of a congregation of dust thereon.

The invention consists of the construction and arrangement of the several parts, which will be more fully hereinafter described and claimed. v

In the accompanying drawings, Figure 1 is a perspective view of a saw and frame, showing the improved attachment applied thereto. Fig. 2 is an enlargedsection through the fan and the feeding device therefor. Fig. 3 is a top plan view of the fan. perspective view of the dust-entrance box and the chute leading therefrom. Fig. 5 is a detail perspective View of the fan-blades and spider therefor. Fig.5 is an enlarged detail view of the outer end of the conduit.

Referring to the drawings, wherein similar numerals are utilized to indicate corresponding parts in the several views, the numeral 1 designates a saw-blade mounted on a shaft 2, having bearing in a frame 3, provided with an adjacent track-frame at. Theseparts may beof any well-known construction, and adjacent one side ofthe saw-blade 1 is the usual guide 5.

Secured to the frame and having its upper end within the guide is a dust-entrance box 6, having an opening 7 in one side thereof Fig. 4 is a detail outer ends.

through which the saw-blade 1 has movement. The upper end of the box is open, as at 8, and to the lower portion of the same an inclined chute 9 is secured or supported adjacentthereto and is inclosed from the point of engagement.therewith by the said box 6 to the upper part of a fan 10. The fan 10 comprises a surrounding horizontally-disposed casing 11, which is open only at the central portion 12 of the top and directly over the eye of the fan 13. The size of this opening is controlled by a slide 12, so as to prevent the circulation caused by the rotation of the sawblade from driving large pieces of bark into the eye of the fan. The outer end of the chute 9 is projected into the opening 12 over the eye of the fan 13 and deposits the dust and small pieces of bark at this point. The chute 9 and fan-casing 11 are secured to or sus-' pended from adjacent parts of the frame 3 and track-frame 4, and the fan 13 is disposed horizontally in the casing and is composed of a central spider 14, having a dimension of about one-third of that of the bottom of the said fan-casing. Rising from the top surface ofthe spider are inner and outer radiallyarranged pairs of cars 15, between which the inner ends of fan-blades 16 are secured. These fan-blades are larger at their outer ends and are gradually reduced toward theirinner ends for the purpose of facilitating the deposit of the dust and pieces of bark onto the eye of the fan and further to increase the efficiency of the fan by having theblades wider at their A vertical shaft 17 is secured to the spider and projects through the bottom of the fan-casing 11 into a step-box 18, and on or near the upper end of said shaft a beveled pinion 19 is fixed.

In the frame 3, at a suitable distance from the saw-shaft 2, asecond shaft 20 is mounted and has thereon a belt or sprocket wheel 21, adapted to be engaged by a chain or belt 22, which runs to a similar Wheel 23 on the sawshaft 2, all as shown in dotted lines in Fig. 1. The shaft 20 projects outwardly under the track-frame 4 and has a pinion 24thereon which meshes with the pinion 19 on the shaft 17 of the fan. This driving mechanism is so timed that the shaft 20 will have a speed relatively to the shaft 2 in about the proportion of two and one-half to one, thereby rapidly operating the fan proportionately to the rotation of the saw-blade 1.

By the use of the spider 14: in the dimension referred to pieces of bark are prevented from falling under the fan-blades and are forced outwardly at such a point relatively to the blades as to be gradually drawn out by centrifugal action and suction until they meet with the forceful effect of said blades and finally driven out from the fan-casin g. This will obviate breaking or clogging of the fanblades and permit them to have an unimpeded operation.

Attached tangentially to the fan-casing 11 is the inner portion of a conveying-conduit 25, which may be of any suitable length and has at an intermediate point therein an adusting connection or section 26, whereby the said conduit may be directed to different points. The outer portion of the said conduit is preferably curved upwardly, as at 2'7, and the end thereof has a flange 28, on which is rotatably mounted a spout 29. This spout is curved similarly to a gooseneck, and pivoted to the outer end thereof is adeflector or hood 30, to the upper central part of which is socured the outer end of a rod or analogous device 31, running back and attached to an operating-lever 32, by which the deflector or hood may be adjusted. The function of the hood is to prevent the dust from being thrown upwardly, particularly in windy weather, and thereby scattered indiscriminately, and by this means also the dust blown out from the spout can be more readily deposited at the different points desired. It will be seen from the foregoing that the conduit is made exceptionally sensitive relatively to the adjustment of the parts and is easily managed, and to support the outer end, or at points intermediate of its length, divergent legs 33, secured to a scat-band 3%, are employed.

The dust is carried by the saw-blade 1 through the opening 7 into the box 6 and flows, together with pieces of bark, into the chute 9 and from thence to the eye of the fan 13. The latter drives the dust and bark out through the conduit at a distance from the machine, and the ordinary mode of cleaning the dust and bark deposit from below the saw and framework is avoided. Furthermore, it will be observed in this construction that the dust is taken at one side of the position of the saw instead of at the bottom, which saves the labor of making a deep pit below the sawblade, with evident disadvantages, as heretofore referred to. As all the dust leaves the saw below the guide and is taken, as in the present instance, at that point by the box (3 and then into the chute 9, all large pieces of bark or heavy splinters that may be knocked from the log are prevented from entering the fan, and thereby the life of the latter is necessarily prolonged. A further advantage results in the winter time by this arrangement, as snow is prevented from entering the fan, and the latter has only clean dust and small pieces of bark to operate upon.

Changes in the proportions and dimensions, as well as the minor details of construction, could be resorted to to accommodate the various applications without in the least departing from the nature or spirit of the invention or sacrificing any of the advantages thereof.

Having thus described the invention, what is claimed as new is- The combination with a saw-blade and frame including a guide, of abox attached to the frame and guide and having an opening in one side through which the saw-blade moves, a chute engaging the lower end of the box, a horizontally-disposed fan to the eye of which the said chute leads, and an adjustable conduit leading from said fan.

In testimony whereof I affix my signature in presence of two witnesses.

MORTIMER L. BROWN. 

